Re: [IRCA] Computer Model of Bog

["Neil Kazaross" <neilkaz@xxxxxxxxxxxxx>]

Theoreticall you get only about 5 1/2 to 5 3/4 dB rejection of signals on a EWE at 90 degrees away from beam peak, but on a BOG I suspect you normally are getting 20 dB+. So this is why the clears up the coast are much weaker on the BOG vs the EWE and that should open up some channels for Carib Isle DX from your QTH.

To get rid of much US QRM, use a Phased BOG System like I do. Run a 2nd BOG about 150 feet shorter than the first and // and about 2 feet away from the first BOG. I suspect since the ends aren't on your land, you cannot terminate them, but don't fret, since unterminated you can phase out main beam pests to DX back end.

ie..if I had that set up at your QTH and wanted to DX high band domestics, I'd phase null WDHP 1620.

My mini-Phased BOG System here is aimed 35 deg and is 341 ft // 214 feet and is stunning for TA's and also for East Tex/East Mex stuff.

Twisted pair is fine for BOG wire.

73 KAZ Barrington IL
  ----- Original Message ----- 
  From: Gil Stacy 
  To: Neil Kazaross ; Mailing list for the International Radio Club of America 
  Sent: Friday, December 22, 2006 3:53 PM
  Subject: Re: [IRCA] Computer Model of Bog



  Neil,
  Thank you, for your valued opinion.  The information is very useful.  At my house, I only have one direction to run my BOG and that is 118/298 degrees with the fed end on the western end.  I  take it up daily, otherwise the wire might disappear as it in the lane behind the house.  It only takes 3-5 minutes to roll up it's 500' length.  My bog is military field wire.  I was lucky and found a full spool of unused military commo wire, WD-1/TT, twin conductor loosely twisted, 67 lbs. of wire, 1 mile in length.   It's tough and each conductor is 7 wires, 3 galvanized steel for strength and spring, 4 tinned copper, .028".  It lies flat on the ground as it was designed to be there.  I soldered conductors together at both ends. Resistance is under the military spec of 46 ohms per 1/4 mile. I am pleased with its performance in the lane.   In the front street, it was almost deaf in comparison.  Compared with a ewe in the front yard which fires in the same direction, 118 degrees,  I've noticed that the bog shuts down many of the clear channels up the coast from here in Savannah, GA.  The ewes fat lobe sucks up the east coast as the ewe is perpendicular to the seaboard.  The ewe is quieter as the back end of the bog fires towards the west with the US behind it from sea to sea. I am about 12 miles from the coast.   One interesting anomaly  is the observed performance on 555 St.Nevis-Kitts ZIZ and 1620 VI, WDHP.  The stations are almost in the line of fire, separated by two degrees, with St. Kitts being barely 100 miles further at more than 1500 + miles from me.  On the ewe, 1620 is 3 dB louder than 555.  On the Bog, 555 is 3 dB louder than 1620.  Must have something to do with a difference in the angle of  waves striking both.  Once again, thank for the help, it is appreciated. 
  73, Gil NN4CW


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